Epitaxial growth of colloidal hydrophilic lattice matched HgTe/CdTe core/shell nanocrystals for UV luminescence

被引:1
作者
Hussain, A. M. P. [1 ]
Sarangi, S. N. [2 ]
Sahu, S. N. [1 ]
机构
[1] Cotton Coll, Dept Phys, Gauhati 781001, Assam, India
[2] Inst Phys, Bhubaneswar 751005, Orissa, India
关键词
Nanostructures; Epitaxial growth; Grazing incidence X-ray diffraction; Raman spectroscopy and scattering; CDSE QUANTUM DOTS; CORE-SHELL NANOCRYSTALS; MERCURY TELLURIDE; RAMAN-SCATTERING; SEMICONDUCTORS; NANOPARTICLES; ZNS; SPECTROSCOPY; CONFINEMENT; FILMS;
D O I
10.1016/j.matchemphys.2012.09.041
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The present work reports a bottom up approach to synthesize water dispersed and highly luminescent hydrophilic L-cysteine ethyl ester hydrochloride (LEEH) capped and lattice matched HgTe/CdTe core/shell nanoparticles (NPs). The LEEH concentration was varied to optimize the luminescent properties of the core/shell NPs by controlling the particle size and its size distribution. FTIR measurements confirm the LEEH capping to the core/shell nanostructures. Transmission electron microscopy (TEM) measurements identify the HgTe, core size as 2.0 nm and that of the shell, epitaxially grown over the core has the thickness as 0.8 nm which corresponds to 2.1 monolayers of CdTe for an optimum LEEN concentration of 4.8 mM. The absorption studies showed excitonic absorption at 293 nm for the optimized core/shell NPs. More than three fold increase of fluorescence (FL) yield in case of the core/shell structure compared to the core has been observed in this study. X-ray diffraction and micro-Raman studies do not show an alloying effect. The crystalline sizes estimated both from X-ray diffraction and HRTEM are found to be comparable. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:389 / 395
页数:7
相关论文
共 56 条
  • [1] Adachi S, 2005, WILEY SER MATER ELEC, P1, DOI 10.1002/0470090340
  • [2] ANOMALOUS MODE IN THE RAMAN AND IR-SPECTRA OF MERCURY TELLURIDE
    BANSAL, ML
    INGALE, A
    ROY, AP
    [J]. PHYSICAL REVIEW B, 1991, 43 (09): : 7020 - 7026
  • [3] Effect of ZnS shell thickness on the phonon spectra in CdSe quantum dots
    Baranov, AV
    Rakovich, YP
    Donegan, JF
    Perova, TS
    Moore, RA
    Talapin, DV
    Rogach, AL
    Masumoto, Y
    Nabiev, I
    [J]. PHYSICAL REVIEW B, 2003, 68 (16):
  • [5] Bussian DA, 2009, NAT MATER, V8, P35, DOI [10.1038/nmat2342, 10.1038/NMAT2342]
  • [6] Aqueous Synthesis of CdTe and HgCdTe Quantum Dots and Their Application in Quantum Dot-Sensitized Solar Cells
    Chen, Ling
    Gong, Haibo
    Wei, Haoming
    Hu, Xilun
    Xu, Hongyan
    Liu, Peng
    Cao, Bingqiang
    [J]. SCIENCE OF ADVANCED MATERIALS, 2012, 4 (02) : 337 - 341
  • [7] Band structures of II-VI semiconductors using Gaussian basis functions with separable ab initio pseudopotentials: Application to prediction of band offsets
    Chen, XJ
    Hua, XL
    Hu, JS
    Langlois, JM
    Goddard, WA
    [J]. PHYSICAL REVIEW B, 1996, 53 (03): : 1377 - 1387
  • [8] (CdSe)ZnS core-shell quantum dots: Synthesis and characterization of a size series of highly luminescent nanocrystallites
    Dabbousi, BO
    RodriguezViejo, J
    Mikulec, FV
    Heine, JR
    Mattoussi, H
    Ober, R
    Jensen, KF
    Bawendi, MG
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (46) : 9463 - 9475
  • [9] Synthesis of luminescent thin-film CdSe/ZnSe quantum dot composites using CdSe quantum dots passivated with an overlayer of ZnSe
    Danek, M
    Jensen, KF
    Murray, CB
    Bawendi, MG
    [J]. CHEMISTRY OF MATERIALS, 1996, 8 (01) : 173 - 180
  • [10] ELECTROSPRAY ORGANOMETALLIC CHEMICAL-VAPOR-DEPOSITION - A NOVEL TECHNIQUE FOR PREPARATION OF II-VI QUANTUM-DOT COMPOSITES
    DANEK, M
    JENSEN, KF
    MURRAY, CB
    BAWENDI, MG
    [J]. APPLIED PHYSICS LETTERS, 1994, 65 (22) : 2795 - 2797